Problem: Polycarp has just invented a new binary protocol for data transmission. He is encoding positive integer decimal number to binary string using following algorithm:

  * Each digit is represented with number of '1' characters equal to the value of that digit (for 0 it is zero ones). 
  * Digits are written one by one in order corresponding to number and separated by single '0' character. 



Though Polycarp learnt how to encode the numbers, he has no idea how to decode them back. Help him calculate the decoded number.

Input

The first line contains one integer number n (1 ≤ n ≤ 89) — length of the string s.

The second line contains string s — sequence of '0' and '1' characters, number in its encoded format. It is guaranteed that the number corresponding to the string is positive and doesn't exceed 109. The string always starts with '1'.

Output

Print the decoded number.

Examples

Input

3
111


Output

3


Input

9
110011101


Output

2031

Solution (in JAVA):

Solution:
import java.util.Scanner;
public class BinaryProtocol{
    public static void main(String[]args){
        readConsole.nextInt();
        System.out.println(problemSolution.decodeString(readConsole.next()));
    }
    public static final Scanner readConsole = new Scanner(System.in);
}
class problemSolution{
    //Method to return decoded String.
    public static String decodeString(String encryptedString){
        //Adding Zero Identifiers.
        encryptedString = addZeroIdentifiers(encryptedString);
        //For Storing final String.
        String decodedString = "";
        //For Counting 1's.
        int charCount = 0;
        //Computing final String.
        for(int x = 0;x<encryptedString.length();++x){
            //Case Zero Found.
            if(encryptedString.charAt(x) == ZERO_IDNT){
                decodedString+= ZERO_CHAR;
            }
            else{
                //Case Zero Found.
                if(encryptedString.charAt(x) ==  ZERO_CHAR){
                    decodedString+=Integer.toString(charCount);
                    charCount = 0;
                }
                else ++charCount;
            }
        }
        //Adding any Remaining Counts.
        decodedString+=Integer.toString(charCount);
        return decodedString;
    }
    //Method to modify string to identify Zeroes.
    public static String addZeroIdentifiers(String newString){
        String finalString = "";
        for(int x = 1;x<newString.length();++x){
            //Adding Zero Identifier.
            if(newString.charAt(x) == ZERO_CHAR && newString.charAt(x-1) == ZERO_CHAR){
                finalString+= ZERO_IDNT;
            }
            else finalString+=newString.charAt(x);
        }
        return ONE_CHAR+finalString;
    }
    //For Storing One Character 
    public static final Character ONE_CHAR = '1';
    //For Storing Zero Character.
    public static final Character ZERO_CHAR = '0';
    //For Storing Zero Identifier.
    public static final Character ZERO_IDNT = 'X';
}